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236th HiLumi WP2 Meeting

Europe/Zurich
Description

Chair: Nicolas Mounet

Minutes: Hannes Bartosik

 

Charge questions to the detectors:

  1. Is the target of PU=170 in Run 5 OK for the detectors? (this is to ensure the 3000fb-1 goal)
  2. If yes, would detectors prefer to have a gradual PU ramp-up already in Run 4 up to 170? 
  3. Concerning commissioning, what is the request of the detectors concerning PU ramp-up in the first year(s) of Run 4? (Wished steps in PU with integrated fb-1) 
  4. Do 8b4e or hybrid schemes pose limitations for the detectors in the HL era? 
  5. Baseline crossing scheme is H-V in IP1-5, respectively, and HL-LHC is compatible with V-H, initially conceived for energy deposition mitigations. Currently we are considering as an option V-H for improved performance with flat optics. What is the feedback or preference from the detectors?
  6. Emittance and bunch intensity of witness bunches are respectively a factor 2 larger and a factor 2 lower than nominal bunches. Is this OK for background? Is there any more margin?